Easy collective polarization switching in ferroelectrics

Details Easy collective polarization switching in ferroelectrics Easy collective polarization switching in ferroelectrics

2000-05-19

arxiv.org/abs/cond-mat/0005333v2

Physics

Condensed Matter

Statistical Mechanics

5 pages, REVTeX 3.1 with one eps-figure. Corrected discussion of single stripe and cylindrical nuclei, and their interaction.

Scientific paper

10.1103/PhysRevLett.85.4614

The actual mechanism of polarization switching in ferroelectrics remains a puzzle for many decades, since the usually estimated barrier for nucleation and growth is insurmountable ("paradox of the coercive field"). To analyze the mechanisms of the nucleation we consider the exactly solvable case of a ferroelectric film with a "dead" layer at the interface with electrodes. The classical nucleation is easier in this case but still impossible, since the calculated barrier is huge. We have found that the {\em interaction} between the nuclei is, however, long range, hence one has to study an {\em ensemble} of the nuclei. We show that there are the ensembles of small (embryonic) nuclei that grow {\em without the barrier}. We submit that the interaction between nuclei is the key point for solving the paradox.

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